[PATCH] Constfold insertelement to undef when index is out-of-bounds

[Paweł Bylica]

Hi majnemer,

This patch adds constant folding of insertelement instruction to undef value when index operand is constant and is not less than vector size or is undef.

InstCombine does not support this case, but I'm happy to add it there also if this change is accepted.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9287

Files:
  lib/IR/ConstantFold.cpp
  test/Transforms/ConstProp/InsertElement.ll
  unittests/IR/ConstantsTest.cpp

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